Nacelle Wind Velocity Correction for Wind Turbines

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Solution Overview

Problem

Nacelle wind velocity measurements by anemometers on wind power generators are inaccurate due to external environmental influences, leading to incorrect cut-in and cut-out speed settings, which results in performance damage and inaccurate power curve calculations.

Innovation Solution

A system that collects nacelle wind velocity data, calculates nonlinear wind velocity differences with standard wind velocity measurements, and uses a correction unit to generate a nonlinear correction equation to adjust the nacelle wind velocity, ensuring accurate cut-in and cut-out speed settings and power curve derivation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If nacelle anemometer is used to measure wind velocity, then wind velocity can be measured at the generator location, but the measurement accuracy deteriorates due to rotor blade rotation and nacelle structure interference

Engineering Contradiction:

Improvewind velocity measurement accuracyVSAvoidrotor blade and nacelle interference

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

The patent introduces a met tower as an intermediary measurement device located away from the nacelle to obtain standard wind velocity data. This mediator provides reference measurements that are not affected by rotor blade and nacelle interference, which are then used to correct the nacelle anemometer readings through comparison and calculation.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The system continuously compares nacelle anemometer measurements with met tower measurements and uses the difference to calculate correction values. These correction values are fed back to adjust future nacelle wind velocity measurements, creating a closed-loop feedback system that progressively improves measurement accuracy.

Inventive Principle:

Principle #23Feedback

2Reliability

If uncorrected nacelle wind velocity is used for control settings, then cut-in and cut-out speeds can be set, but the reliability deteriorates due to inaccurate measurements

Engineering Contradiction:

Improvecontrol setting accuracyVSAvoidnacelle wind velocity accuracy

Core Design Contradiction:

ReliabilityVSMeasurement precision

Solution Approach 1:

The system establishes a feedback mechanism where met tower measurements continuously validate and correct nacelle anemometer readings. The correction values derived from comparing the two measurement sources are applied to improve the reliability of control settings for cut-in and cut-out speeds.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent replaces direct reliance on the mechanically interfered nacelle anemometer with a corrected measurement system that uses met tower data. This substitution eliminates the harmful mechanical interference effects while maintaining the benefit of local wind velocity measurement.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Manufacturing precision

If nacelle wind velocity is used for power curve calculation, then local performance can be assessed, but the manufacturing precision deteriorates due to measurement errors

Engineering Contradiction:

Improvepower curve accuracyVSAvoidwind velocity measurement accuracy

Core Design Contradiction:

Manufacturing precisionVSMeasurement precision

Solution Approach 1:

The correction mechanism uses continuous feedback from met tower measurements to adjust nacelle anemometer readings. This feedback loop ensures that power curve calculations are based on corrected wind velocity data that compensates for measurement errors, thereby improving the accuracy of performance assessment.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The met tower serves as an intermediary reference system that provides accurate wind velocity measurements free from nacelle interference. These intermediary measurements are used to calibrate and correct the primary measurement system, ensuring accurate power curve generation.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS9103318B2System and method for correcting nacelle wind velocity of wind power generator

Publication Date: 2015.08.11 SAMSUNG HEAVY IND CO LTD

AI summary

A system and method for correcting a nacelle wind velocity of a wind power generator are provided. The nacelle wind velocity correction system includes: a measurement information collection unit that collects a nacelle wind velocity that is measured by a nacelle anemometer that is installed on a nacelle of the wind power generator; a wind velocity difference generator that generates nonlinear wind velocity difference information of a nacelle wind velocity on a unit basis by calculating a wind velocity difference between a standard wind velocity of a met tower that is measured for a predetermined period and the nacelle wind velocity; a correction unit that generates a nonlinear correction equation using the nacelle wind velocity and the nonlinear wind velocity difference information and that calculates a nacelle correction wind velocity according to the nonlinear correction equation; and a controller that controls an operating state of the wind power generator according to a preset cut-in speed and cut-out speed using the nacelle wind velocity.